Spark-intensifier.



W. J. CUNNINGHAM. SPARK INTENSIFIER.

APPLICATION FILED MAY 28. 1912.

Patentedfiept. 10,1918.

IN YEN T DH WILLIAM J. CUNNINGHAM, OF TOLEDO, OHIO, ASSIGNOR OF ONE-HALF T0 FRED G.

- MEYER, OF DETROIT, MICHIGAN.

srARK-mrnnsrmnn.

Specification of Letters Patent.

Patented Sept. 10, 1918.

Application filed May 28, 1917. Serial No. 171,515.

To all whom it may concern:

Be it known that I, WILLIAM J. CUNNING- RAM, a citizen of the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have invented a certain new and useful Spark-Intensifier; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to spark intensifiers and to one particularly adapted for use in connection with spark-plugs.

Theprimary object of my invention is the provision of an improved device of this character which is simple and inexpensive in its construction, capable of having the parts easily and quickly assembled, is less liable to breakage than similar devices heretofore used, and is adapted to be easily and quickly applied to a spark-plug. Other objects and advantages of the invention will be apparent to persons skilled in the art.

The invention is fully described in the following specification, and while, in its broader aspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,

Figure 1 is a side view of a'device e1nbodying the invention. Fig. 2 is an enlarged central longitudinal section thereof. Fig. 3 is a perspective view of the barrel member of the device, and Fig. 4 is a section of an electrode and its carrying member before attaching to the barrel.

Referring to the drawings, 1, l designate axially spaced electrodes, one of which projects inward from an end member 2, while the other projects inward from an end member 8. The end member 2, has a binding screw 4 threaded axially in its outer end for binding a terminal wire thereto, while the member 3 has an extension at its outer end provided with a transverse opening 5 for receiving the terminal post of a spark- -plug to which it is attached.

A barrel 6, preferably of glass, coacts with the end members 2 and 3 to rigidly space the same, and incloses the electrodes 1, 1. This I barrel is provided adjacent to each end with an external annular recess 7 for receiving the edge of an inwardly rolled annular flange 8 on the respective end member, whereby the barrel and end members are firmly secured together. The flange 8 of each end member, before being attached to a barrel, is in the form of a cap, as shown in Fig. 4, for fitting over an end of the barrel, the edge of the flange being then turned into the recess 7 to hold the barrel. In order to prevent a relative turning of the barrel and end members, each end member is prO- vided on its outer edge with one or more lugs 9, which enter registering notches 10 in the barrel end.

It is evident that in assembling the barrel and end members, each end member is placed in end abutting relation to the barrel with its lugs 9 inserted in the registering notches 10, and with its flange 8 in open or outward turned position. subjected to an inward rolling or turning pressure by machine or otherwise, which causes its edge to enter the recess 7 in the adjacent barrel end and to coiiperate therewith to firmly unite the two parts. When the device parts are assembled, the electrodes 1, 1 are held in rigid predetermined spaced relation, it being preferable to rigidly space the electrodes than to have them adjustable, for if adjustable, a person using the same, unless experienced in such use, is apt to so adjust the electrodes that the gap is either teo narrow or too wide. If the gap is too wide, injury is very apt to be done to the electric generating means as is apparent to persons skilled in the art.

The flange edge is then I wish it understood that my invention is not limited to any specific construction, ar-

rangement or form of the parts as it is caimaeai for each end of the barrel fitting against jecting into the respective end of the barrel the same and having an integral flange and forming an electrode which is axially which extends around the barrel end and spaced with relation to the electrode of the 310 intothe adjacent recess, said flange being other end member.

5v provided with an integral lug for fitting In testimony whereof, I have hereunto into the adjacent end notch, each of said signed my name to this specification. members also having an integral stud pro- WILLIAM J. CUNNINGHAM. 

